// Promise.resolve(1) // 静态方法 state method
Promise.reject(1)
    .then(res => {
        console.log(res);
        return 2;  // promise.resolve(2)
    })
    .then(res => {
        console.log(res)
    })    
    .catch(err => {
        return 3; // Promise.resolve(2)
    })